RxJS Subjects and Multicasting Operators by André Staltz

• An Observable execution may only have one Observer
• Subject: an Observable and Observer hybrid
• Using a Subject as an Event Bus
• BehaviorSubject: representing a value over time
• ReplaySubject: remembering events from the past
• AsyncSubject: representing a computation that yields a final value
• Connection operator: multicast and connect
• Stopping a shared observable execution
• RefCount: automatically starting and stopping an execution
• Multicasting shortcuts: publish() and variants
• Reusable multicasting with Subject factories
• Multicast with a selector argument, as a sandbox
• Conclusion: when to use Subjects